[MERGE] improved help on storage formats

[Ian Clatworthy]

We frequently get people asking on the mailing list and
IRC about which storage format they ought to select.
This patch improves the help by:

* including a decision tree (based on some emails by
  Robert Collins)

* including some suggestions from John Arbash Meinel,
  e.g. moving knit-based repositories into the
  deprecated list.

It would also be good to include more information on
rich-root vs non-rich-root. My preference though is
to do that as a separate patch. (To provide answers
to the questions users have about that - compatibility,
performance, etc - warrants a new, additional help topic
me thinks).

Ian C.
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